In article . com, DerbyDad03 wrote:

I need some clarification...

count all current carrying conductors entering the box (hot and
neutral), you count all the EGCs as only one wire

So, is a piece of 14/2 with ground counted as 3 "terms" or 2? i.e.
requireing 6 in^3 or 4 in^3?

Depends on how many *other* cables are present. All the equipment grounding
conductors together count as only one. So if you have only one 14/2 WG cable,
that counts as three conductors. Two such cables counts as five conductors
(two black, two white, plus one for the two EGCs). Three cables counts as
seven (3 black, 3 white, plus one for the 3 EGCs). And so on.

If the cables have conductors of different sizes, count the all EGCs as one
conductor of the largest size. For example, if the box contains two 14/2 WG
cables and two 12/2 WG, you count (4) 14ga and (5) 12ga to determine the
required capacity.

Note also that conductors that don't leave the box (e.g. pigtails) are not
counted at all. Neither are up to 4 fixture wires 14ga and smaller.

you count any internal wire clamps

Is an internal wire clamp the same as a wire nut

No

or do you mean the
clamp that secures the romex in the hole?

Yes -- if the clamp is inside the box. The standard Romex connectors that
mount through a knockout and are secured with a locknut inside the box have
the clamp *outside* the box, and are not counted.

What is the X in^3 for either item?

Same as that for the largest conductor present. For example, if the box
contains both 12ga and 14ga wires, you count the clamp as a 12ga.

count each device (yoke) in the box as two allowances

What's a yoke?

A strap that holds wiring devices such as switches or receptacles -- or
fixture nipples.

In the case of this "light fixture ceiling box" how
does it (device/yoke) enter into the equation? It's not *in* the box,
per se.

If the fixture mounts directly to the box, it doesn't. If the fixture mounts
to a strap that mounts to the box, that's your yoke.


--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.